I enjoyed this book. I liked the setting, the characters were interesting, and the mystery was also interesting. The chocolate foods in this book actually really made me hungry, so much that after taking a break from reading, I had to go and snack on some chocolate I had! Lol. The culprit wasn't obvious here and the author did a good job of not making them look obvious and making everyone look like the possible culprit. But I was a bit doubtful when the culprit at the end decides to stop trying to kill everyone and has a nice chat about how they did what they did and also didn't notice right away that someone was gone, going to call the police. That was a bit unbelievable. I also felt Nancy wasn't doing some things that she should have done to solve the mystery, like call some nearby pet shops that might have ants and ask who purchased some(ants were used for one of the pranks in this book) or ask some certain questions or fully investigate the suspects. I also felt some of Nancy's investigating near the end should have been done at the beginning or middle of the book and that probably the mystery would have been solved by then, but of course that would make for a short book. I also felt that it was a bit foolish of Nancy when she goes to meet the culprit alone without having a plan or anything if something goes wrong(which of course does go wrong!). Overall, this is a good book, I enjoyed it all the way through. 3 stars.